Depends on interpretation. IIRC currently the same die is used for 440EPx and 
440GRx. I could be wrong here though and it is just a bug in the chip. But 
anyway we should support this somehow. Could be that I missed this in the 
current 440GRx (Rainier) arch/ppc support too. I have to admit, that no 
clever solution comes to my mind right away though.

We can always come up with some kind of runtime detection, by turning on
MSR:FP, issuing an fp instruction and catching the illegal instruction
fault if any :-)

Ben.